Which of the following defines a biological species?
A. Organisms sharing the same genetic code
B. Organisms having similar physical appearances
C. Organisms that can interbreed and produce fertile offspring
D. Organisms living in the same habitat
Answer: Option C
Solution (By JKSSB Mock Tests)
A biological species is defined as a group of potentially interbreeding natural populations that are reproductively isolated from other such groups and produce fertile offspring. Physical similarity or shared habitat does not guarantee species status, as reproductive isolation is the key criterion.
Explanation:
Grazing food chain begins with producers (plants). Decomposers break down dead matter at all levels; energy decreases at higher levels; producers are plants/algae.
Explanation:
Blood group O lacks A and B antigens on red cells but contains both anti-A and anti-B antibodies in plasma. This makes it the universal donor for packed red cells but dangerous plasma donor. Group AB has no antibodies. So, the presence of both antibodies is correct.
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